无轴承外转子异步电动机的设计及有限元分析  

Design and finite element analysis of bearingless outer rotor asynchronous motor

作　　者：孙宇新[1] 王浩[1] 杜怿[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2016年第3期321-326,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(61174055;51307072)

摘　　要：为了提高飞轮储能系统运行的精度和可靠性,减小转矩脉动及悬浮脉动对系统运行的影响,对无轴承外转子异步电动机径向悬浮力及转矩与电动机结构参数的关系进行了分析,提出了减小转矩脉及悬浮脉动的一般方法.介绍了无轴承异步电动机工作原理,基于此推导了电动机数学模型.结合传统异步电动机设计方法,设计了一台功率为0.5 k W,转矩绕组极对数Pt=2,径向悬浮力绕组极对数Ps=1的无轴承外转子异步电动机.基于有限元软件计算了无轴承外转子异步电动机的磁场分布,确定径向悬浮力、转矩和悬浮绕组电流之间的关系,并得到电动机气隙长度和磁场饱和对径向悬浮力的影响规律,而且考虑了不同槽配比和定子极弧系数对悬浮力及转矩的影响.结果表明,当电动机转矩绕组电流和悬浮绕组电流分别为额定电流2.5 A和2.0 A时,转矩为1 N·m,转子径向悬浮力为105 N,能够实现转子的稳定悬浮.To improve the accuracy and reliability of flywheel energy storage system and reduce the effects of torque ripple and suspension force ripple on system operation,the relationships of the suspension force and torque of bearingless outer rotor asynchronous motor with motor structure parameters were analyzed.The general methods were proposed to minimize torque ripple and suspension force ripple. Based on the working principle of bearingless asynchronous motor with outer rotor,the mathematic model of motor was deduced. According to the traditional asynchronous motor design method, a 0. 5 k W bearingless asynchronous motor with outer rotor was designed by dichotomy approach with two pole-pair torque winding and one pole-pair radial suspension winding. The distribution of magnetic field was simulated by FEM,and the relationship among radial suspension force,torque and winding current was determined. The effects of magnetic saturation and size of airgap on radial suspension force were also investigated with consideration of the effects of slot ratio and stator pole arc coefficient. The results show that with respective torque windings and radial suspension force windings rated currents of 2. 5 A and 2. 0 A,the rotor of prototype motor can bestably suspended with torque of 1 N·m and rotor radial suspension force of 105 N.

关 键 词：无轴承电动机 异步电动机 外转子 有限元分析 模型 

分 类 号：TM341[电气工程—电机]